Liquid crystal driver and liquid crystal display device using the same
First Claim
Patent Images
1. A liquid crystal driver comprising:
- a plurality of output terminals for outputting display voltages to be applied to a liquid crystal display device;
an input terminal for receiving display data corresponding to said plurality of output terminals; and
output means for converting said input display data into said output display voltages;
wherein said output means selects a display voltage level corresponding to one input display data and simultaneously generates two different display voltages from the selected display voltage level so that either one of said two different display voltages can be selected as an output display voltage for each of said output terminals.
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Abstract
A liquid crystal driver includes a voltage generator for generating gray scale voltages on the basis of reference voltages, and an output device for selecting one gray scale voltage from the generated gray scale voltages in accordance with display data, for applying inversion/non-inversion control to the selected gray scale voltage with respect to an inversion reference voltage on the basis of the selected gray scale voltage, an AC switching signal and the inversion reference voltage, and for outputting different liquid crystal supply voltages for one and the same display data to a liquid crystal panel.
25 Citations
34 Claims
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1. A liquid crystal driver comprising:
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a plurality of output terminals for outputting display voltages to be applied to a liquid crystal display device;
an input terminal for receiving display data corresponding to said plurality of output terminals; and
output means for converting said input display data into said output display voltages;
wherein said output means selects a display voltage level corresponding to one input display data and simultaneously generates two different display voltages from the selected display voltage level so that either one of said two different display voltages can be selected as an output display voltage for each of said output terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of applying display voltages to a liquid crystal display device, the method comprising the steps of:
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receiving display data corresponding to output terminals which output display voltages;
generating gray scale display voltage levels on the basis of reference voltages;
selecting one of the gray scale display voltage levels for each output terminal in accordance with said display data, the selected gray scale display voltage level being a first display voltage for the output terminal;
supplying an AC switching signal and an inversion reference voltage, said AC switching signal having a polarity which is periodically inverted;
inverting said selected gray scale voltage level with respect to said inversion reference voltage to generate an inverted selected gray scale display voltage level, the inverted selected gray scale display voltage level being a second display voltage for the output terminal, the second display voltage being different from the first display voltage, the first display voltage and the second display voltage being available simultaneously;
selecting one of the first display voltage and the second display voltage in accordance with the AC switching signal as an output display voltage for the output terminal; and
outputting the output display voltage from the output terminal.
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17. A display device comprising:
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a display panel for displaying an image in accordance with display data; and
a driver being arranged on a single side of said display panel;
wherein said driver includes;
a first circuit for generating a plurality of first voltages and a plurality of second voltages and for simultaneously outputting said first and second voltages, said first voltage corresponding to respective gray scales and said second voltages having inverted polarity of said first display voltages; and
a second circuit for selecting driving voltages from said first and second voltages according to said display data and for outputting said selected driving voltages to said display panel; and
wherein said selected driving voltages which correspond to adjacent two outputs of said second circuit have different polarity from each other, and voltages which correspond to adjacent two pixels in a line direction of said display panel have different polarity from each other. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A display device comprising:
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a display panel for displaying an image in accordance with display data; and
a driver being arranged on a single side of said display panel;
wherein said driver includes;
a first circuit for generating a plurality of first voltages and a plurality of second voltages and for simultaneously outputting said first and second voltages, said first voltages corresponding to respective gray scales and said second voltages having inverted polarity of said first display voltages; and
a second circuit for selecting driving voltages from said first and second voltages according to said display data and for outputting selected driving voltages to said display panel; and
wherein a polarity of said driving voltages of odd column outputs of said second circuit is different from a polarity of said driving voltages of even column outputs of said second circuit, and a polarity of voltages of odd column pixels of said display panel is different from a polarity of voltages of even column pixels of a same line of said display panel. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A display device comprising:
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a display panel for displaying an image in accordance with display data; and
a driver being arranged on a single side of said display panel;
wherein said driver includes;
a first circuit for generating a plurality of first voltages and a plurality of second voltages and for simultaneously outputting said first and second voltages, said first voltages corresponding to respective gray scales and said second voltages having inverted polarity of said first display voltages; and
a second circuit for selecting driving voltages from said first and second voltages according to said display data and outputting said selected driving voltages to said display panel; and
wherein said selected driving voltages which correspond to adjacent two group outputs of said second circuit have different polarity from each other, and voltages which correspond to adjacent two groups, each group including a plurality of pixels, in a line direction of said display panel, have different polarity from each other. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification